I know this is an old thread, but I'm having the same problems.
Running the newest calibre 0.8.7 on Ubuntu 11.04. It always seems to be same:
- bulk convert a number of books. In this latest case is was odt->mobi, but I don't think it matters.
- The last conversion hangs at 100%
- need to kill the process to stop
- Convert that single book doesn't work. Hangs again at 100%
- Restart calibre and try again. Now it works.
Hope this helps.
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